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EEE M W 24B 24A 27B 27A N Patent Application Publication Dec US 2009031 1494A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2009/0311494 A1 YAMASHTA et al. (43) Pub. Date: Dec. 17, 2009 (54) RELIEF PRINTING PLATE PRECURSOR FOR (30) Foreign Application Priority Data LASER ENGRAVING, RELIEF PRINTING PLATE, AND PROCESS FOR PRODUCING Jun. 17, 2008 (JP) ................................. 2008-157907 RELEF PRINTING PLATE Feb. 10, 2009 (JP) ................................. 2009-028816 (75) Inventors: Masako YAMASHITA, Publication Classification Shizuoka-ken (JP); Atsushi (51) Int. Cl. SUGASAKI, Shizuoka-ken (JP) B32B 3/00 (2006.01) Correspondence Address: GO3F 7/20 (2006.01) Moss & Burke, PLLC GO3F 7/004 (2006.01) 401 Holland Lane, Suite 407 Alexandria, VA 22314 (US) (52) U.S. Cl. .................... 428/195.1: 430/306: 430/286.1 (73) Assignee: FUJIFILM CORPORATION, (57) ABSTRACT Tokyo (JP) A relief printing plate precursor for laser engraving, including (21) Appl. No.: 12/476,260 a relief forming layer containing (A) a polymerizable com pound having an ethylenic unsaturated bond. (B) a binder (22) Filed: Jun. 2, 2009 polymer, and (C) a compound having deodorizing ability. 11 50 FA - 42 SUB SCANNING DIRECTION -10 - 228 7.s 55 21B EEE m w 24B 24A 27B 27A N Patent Application Publication Dec. 17, 2009 US 2009/0311494 A1 F.G. 1 FA SCANNING DIRECTION 7OA a. CSy ra & 5A - 27WSNS AD 23Ar S3EEASEE21 E-25sagaa EEEEEEEEEEEEEEEEEEEEEEEEE-22s awslighlights fskillsw. 21B 2 TTT "TT". US 2009/031 1494 A1 Dec. 17, 2009 RELEF PRINTING PLATE PRECURSORFOR mask to develop and remove an uncured area, and there is LASER ENGRAVING, RELIEF PRINTING room for improvement since development treatment is nec PLATE, AND PROCESS FOR PRODUCING essary. RELEF PRNTING PLATE 0010. As a method of making a plate without requiring a developing step, many So-called "direct engraving CTP meth CROSS-REFERENCE TO RELATED ods” have been proposed in which a relief forming layer is APPLICATION directly engraved with a laser to make a plate. The direct engraving CTP method is a method of forming concavity and 0001. This application claims priority under 35 USC 119 convexity, which are to be a relief, by engraving with a laser, from Japanese Patent Application Nos. 2008-157907 and and has an advantage in that unlike a relief formation method 2009-028816, the disclosures of which are incorporated by using an original image film, a relief shape can be freely reference herein. controlled. For this reason, when an image Such as an outline character is formed, its region may be engraved deeper than other regions, or in a fine dot image, in view of resistance to BACKGROUND OF THE INVENTION a printing pressure, engraving with a shoulder may be per 0002 1. Field of the Invention formed. 0003. The present invention relates to a relief printing 0011. However, there is a problem in that, for forming a plate precursor for laser engraving, a relief printing plate, and relief having concavity and convexity withstanding a printing a process for producing a relief printing plate. pressure on a relief forming layer having a predetermined thickness, a high energy is necessary, and since a rate of laser 0004 2. Description of the Related Art engraving is slow, productivity is low as compared with a type 0005. As a method of forming concavity and convexity on for forming an image via a mask. a photosensitive resin layer laminated on a Support Surface to 0012 For this reason, improvement in a sensitivity of a form a printing plate, a method of exposing a relief forming relief plate precursor has been tried and, for example, a flexo layer formed using a photosensitive composition with ultra graphic printing plate precursor for laser engraving including violet light via an original image film to selectively cure an a foamed elastomer has been proposed (see e.g. JP-A No. image area, and removing an uncured area with a developer, 2002-357907). In this technique, improvement in an engrav so-called “analog platemaking, is well known. ing sensitivity is made by using a foamed material having a 0006. A relief printing plate is a letterpress printing plate low density in a relief forming layer, but since it is a material including a relief layer having concavity and convexity, and having a low density, a strength for a printing plate is insuf Such a relief layer having concavity and convexity is obtained ficient, and print durability is remarkably deteriorated. by patterning a relief forming layer containing a photosensi 0013. In addition, for example, Japanese Patent No. tive composition containing an elastomeric polymer Such as a 2846954, JP-A No. 11-338139, and JP-A No. 11-170718 synthetic rubber, a resin Such as a thermoplastic resin, or a disclose a flexographic plate precursor which may be laser mixture of a resin and a plasticizer as a main component, to engraved, or a flexographic plate obtained by laser engraving. form concavity and convexity. Among such relief printing In these publications, a monomer is mixed into an elastomeric plates, a printing plate having a soft relief layer is sometimes rubber as a binder, the mixture is cured by a thermal polymer called a flexographic plate. ization mechanism or a photopolymerization mechanism, 0007 When a relief printing plate is made by analog plate and laser engraving is performed to obtain a flexographic making, generally, since an original image film using a silver plate, but there is a problem in that an unpleasant odor Such as salt material is required, the production time and the cost for a burnt rubber odor is generated at laser engraving. the original image film are necessary. Further, since chemical 0014. In addition, as a problem possessed by the direct treatment is necessary for developing an original image film, engraving CPT method, there is a slow rate of laser engraving. and disposal of a development waste solution is also neces This is because in the mask CTP method, a thickness of a sary, further simpler processes for producing a plate Such as, mask layer element to be ablated is around 1 to 10 um, while for example, a method not using an original image film, and a in the direct engraving CTP method, it is necessary to engrave method not requiring development treatment are being stud at least 100 um for directly forming a relief. ied. 0015 For this reason, Some proposals aiming at improving 0008. In recent years, a method of platemaking of a relief a laser engraving sensitivity have been made as follows. forming layer by scanning light exposure without requiring 0016 For example, a flexographic printing plate precursor an original film is being studied. for laser engraving including a foamed elastomer has been 0009 For a procedure not requiring an original film, a proposed (see e.g.JP-A No. 2000-3 18330). In this technique, relief printing plate precursor has been proposed in which a by using a foamed material having a low density, improve laser-sensitive mask layer element which can form an image ment in an engraving sensitivity is made, but since the mate mask is provided on a relief forming layer (see e.g. Japanese rial is a material having a low density, there is a problem in Patent No. 2773847 and Japanese Patent Application Laid that a strength as a printing plate is insufficient, and print Open (JP-A) No. 9-171247). According to the process of durability is remarkably deteriorated. platemaking using the plate precursor, since an image mask 0017 For example, a flexographic printing plate precursor having the same function as that of an original image film is for laser engraving containing a microsphere in which a formed from the mask layer element by laser irradiation hydrocarbon gas has been encapsulated, has been proposed based on image data, the process is called a “mask CTP (see e.g. US Patent Application Publication 2003/180636). In method”. In this process, an original image film is not this technique, by a system of expanding a gas in a micro required, but platemaking treatment thereafter is a step of sphere with heat produced by a laser, and disintegrating a performing light exposure with ultraviolet light via an image material to be engraved, improvement in an engraving sensi US 2009/031 1494 A1 Dec. 17, 2009 tivity is made, but since the material is a material containing 0026. The relief printing plate precursor for laser engrav bubbles, there is a problem in that a strength as a printing plate ing of the invention is also referred to as simply “relief print tends to be lacking. In addition, since a gas has a nature of ing plate precursor of the invention'. being easily expanded with heat as compared with a solid, 0027. Since the relief printing plate precursor of the inven even when a microsphere having a high thermal deformation tion has a Sufficiently high engraving sensitivity when carry initiating temperature is selected, a Volume change due to ing out laser engraving, and may perform laser engraving at a high speed, an engraving time may be shortened and, at the change in an external temperature cannot be avoided, and same time, an unpleasant odor generated at laser engraving thus, it is not suitable to use a material containing bubbles in may be suppressed. a printing plate required to have stability of a thickness pre 0028 Respective components constituting the relief form cision. ing layer will be explained below. 0018 For example, a resin letterpress printing plate for 0029 <(A) Polymerizable Compound Having Ethylenic laser engraving containing a polymer filler having a ceiling Unsaturated Bondd temperature of lower than 600 K has been proposed (see e.g.
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